Iran's decades-long investment in Hezbollah, Iraqi militias, Hamas, Palestinian Islamic Jihad, and the Houthis has reshaped the Middle East's security landscape. Yet recent wars reveal both the strengths and growing weaknesses of Tehran's regional proxy strategy.

An in-depth analysis of Iran's regional proxy network, the Axis of Resistance, and how Hezbollah, Iraqi militias, Hamas, and the Houthis shape Middle East geopolitics.

Introduction

Few countries have transformed regional geopolitics through indirect warfare as effectively as Iran. Rather than relying solely on conventional military power, Tehran has spent more than four decades cultivating an extensive network of allied armed organizations stretching from Lebanon to Yemen. This strategy has enabled Iran to project influence far beyond its borders while avoiding many of the costs associated with direct military confrontation.

Today, this network—commonly described as the Axis of Resistance—includes Hezbollah in Lebanon, various Shiite militias in Iraq, Hamas and Palestinian Islamic Jihad in Gaza, the Houthis in Yemen, and smaller affiliated groups operating across Syria and elsewhere. Coordinated largely through the Islamic Revolutionary Guard Corps' (IRGC) elite Quds Force, these organizations have become central to Iran's regional security doctrine.

However, the conflicts that have unfolded since October 2023 have raised fundamental questions about the sustainability of this model. While Tehran's proxies have demonstrated considerable military capability, they have also suffered significant losses, exposing structural vulnerabilities that could reshape the balance of power across the Middle East.

Iran has invested heavily in proxy militias since the regime's founding in 1979. In the decades that followed, groups such as Hezbollah in Lebanon, Shi'a militias in Iraq and Syria, and the Houthis in Yemen have projected Iran's influence across the region. Today, Iran's proxy network is considerably weakened due to Israel's military actions following October 7, 2023, and the fall of the Assad regime in Syria. Yet the Houthis' attacks on Israel and against Red Sea shipping demonstrate how Iran's support to these groups continues to facilitate their conduct in violation of international law. This article examines Iran's potential responsibility for acts on the part of its proxies that violate its international legal obligations. It assesses first the grounds on which the proxies' acts could be attributable to Iran before addressing Iran's potential responsibility for aiding and assisting its proxies' harmful conduct. Finally, the article considers Iran's potential breach of primary norms of international law, such as the prohibition on the use of force, through its support to the proxy groups. The analysis highlights the varied relationships between Iran and its proxies and the difficulties that arise when seeking to hold Iran to account. Many of the proxy groups act with a degree of independence that precludes the attribution of their conduct to Iran. Other States might therefore be better served by calling Tehran out for its violation of primary norms of international law, including Common Article 1 to the Geneva Conventions.

The Origins of Iran's Proxy Strategy

Iran's proxy doctrine emerged following the 1979 Islamic Revolution. The revolutionary leadership viewed the export of its ideological vision as essential to safeguarding the Islamic Republic against regional and international adversaries.

Unable to compete militarily with the United States or Israel on conventional terms, Iran instead developed an asymmetric strategy centered on non-state armed groups. This approach allowed Tehran to extend its influence while maintaining plausible denmial for many military operations conducted outside its borders.

The IRGC's Quds Force became the principal institution responsible for building these relationships. Beyond supplying weapons, Tehran invested heavily in training, intelligence sharing, ideological education, logistics, and financial assistance.

Over time, this evolved into one of the world's most sophisticated transnational networks of allied militias.

Hezbollah: The Cornerstone of Iranian Influence

Among all of Iran's regional partners, Hezbollah remains its most capable and strategically valuable ally.

Founded during Lebanon's civil war in the early 1980s with direct Iranian assistance, Hezbollah has evolved into far more than an armed movement. It combines military capabilities with political representation, social services, intelligence operations, and extensive regional networks.

For Tehran, Hezbollah serves multiple strategic purposes:

• A forward military deterrent against Israel.
• A conduit for supporting Palestinian armed groups.
• A bridge connecting Iranian influence to the eastern Mediterranean.
• A training hub for other Iranian-backed organizations.

The group's extensive rocket arsenal has long been viewed as one of Iran's primary deterrents against potential attacks on Iranian territory.

Iraq: Iran's Strategic Depth

Following the 2003 U.S. invasion of Iraq, Iran dramatically expanded its influence among Iraqi Shiite political parties and armed groups.

Organizations such as Kataib Hezbollah, Asaib Ahl al-Haq, the Badr Organization, and Harakat al-Nujaba became increasingly integrated into Iraq's security architecture through the Popular Mobilization Forces (PMF).

These militias have provided Tehran with several strategic advantages:

• Political influence inside Baghdad.
• A land corridor connecting Iran to Syria and Lebanon.
• Pressure against U.S. military forces.
• Additional missile and drone launch platforms.

Iraq has therefore become not merely a neighboring country but one of the central pillars of Iran's regional security architecture.

Hamas and Palestinian Islamic Jihad

Although Hamas is a Sunni Islamist movement and differs ideologically from Shiite Iran, both share a common strategic objective: opposing Israel.

Iran has supplied varying levels of financial assistance, military expertise, missile technology, and training to Hamas over many years. Palestinian Islamic Jihad has maintained even closer ties with Tehran.

These relationships have enabled Iran to maintain influence in the Palestinian arena while expanding pressure on Israel without direct Iranian military involvement.

The Houthis: Expanding Iran's Reach into the Red Sea

Perhaps the most surprising evolution in Iran's regional strategy has been the emergence of Yemen's Houthi movement as a significant strategic partner.

Initially viewed primarily as a domestic Yemeni insurgency, the Houthis gradually developed stronger military and political ties with Tehran.

Their growing arsenal of drones and ballistic missiles has allowed them to threaten:

• Saudi Arabia.
• The United Arab Emirates.
• International shipping in the Red Sea.
• Israeli territory.

The Houthis have effectively expanded Iran's strategic reach into one of the world's most critical maritime chokepoints.

The Quds Force: Coordinating the Network

At the center of this regional architecture stands the IRGC Quds Force, responsible for coordinating relationships among Iran's partners.

Its responsibilities include:

• Military training.
• Weapons transfers.
• Financial assistance.
• Intelligence sharing.
• Strategic planning.
• Operational coordination.

Rather than exercising absolute command over each organization, the Quds Force generally aligns these groups around shared strategic objectives while allowing significant local autonomy.

This flexible model has enabled Iran to adapt to changing regional conditions.

Strategic Objectives Behind the Axis of Resistance

Iran's investment in proxy forces serves several long-term strategic goals.

1. Deterrence

Forward-deployed allied organizations create multiple fronts that complicate military planning for Israel and the United States.

2. Regional Influence

Proxy groups provide Tehran with political leverage inside neighboring countries without requiring formal military occupation.

3. Cost-Effective Power Projection

Supporting local partners is considerably less expensive than maintaining large overseas military deployments.

4. Strategic Depth

By moving potential conflict away from Iranian territory, Tehran seeks to prevent direct attacks on the homeland.

The Advantages of Proxy Warfare

Iran's proxy strategy offers several military and political benefits.

It allows Tehran to influence conflicts while reducing the likelihood of direct retaliation against Iran itself.

Proxy warfare also provides flexibility. Local groups possess better knowledge of their operational environments and can respond more rapidly to evolving circumstances.

Moreover, these organizations often possess domestic political legitimacy within their own constituencies, making them more resilient than foreign expeditionary forces.

Emerging Weaknesses

Recent regional conflicts have also exposed significant vulnerabilities.

Several Iranian-backed organizations have experienced:

• Leadership losses through targeted strikes.
• Financial pressures.
• Intelligence penetration.
• Reduced domestic legitimacy.
• Military attrition.

The wars following October 2023 demonstrated that while Iran's network remains extensive, maintaining coordination among diverse organizations operating under different national conditions has become increasingly difficult.

These developments have prompted growing debate among analysts over whether Tehran's proxy model is entering a period of strategic adjustment.

Implications for Israel and the United States

For Israel, Iran's proxy network presents a persistent multi-front security challenge. Military planners must account simultaneously for threats originating from Lebanon, Gaza, Syria, Iraq, and Yemen.

For the United States, Iranian-backed groups have repeatedly targeted American personnel and facilities throughout the region, increasing the risk of broader escalation even when Washington seeks to avoid direct conflict with Tehran.

Consequently, regional crises increasingly involve not only state actors but also an interconnected network of armed organizations whose actions can rapidly alter the strategic landscape.

The Future of Iran's Regional Strategy

Despite mounting pressures, Iran is unlikely to abandon its reliance on proxy organizations.

The strategy remains central to Tehran's doctrine of asymmetric warfare and offers capabilities that conventional military expansion cannot easily replicate.

However, the future effectiveness of the Axis of Resistance will depend on several factors:

• Iran's economic capacity to sustain financial support.
• The ability of proxy organizations to recover from recent conflicts.
• Regional political developments in Lebanon, Iraq, Syria, and Yemen.
• The evolution of U.S. and Israeli military strategies.
• Internal political dynamics within Iran itself.

Rather than disappearing, Iran's proxy network may evolve toward a more decentralized and adaptive model designed to withstand increasing military and financial pressure.

Conclusion

Iran's regional armed network represents one of the most consequential geopolitical developments in the modern Middle East. Over four decades, Tehran has transformed relatively small militant organizations into an interconnected architecture capable of influencing conflicts across multiple theaters.

This strategy has enabled Iran to project power far beyond its borders, deter adversaries, and shape regional politics through indirect means. Yet the same conflicts that demonstrated the network's reach have also revealed its vulnerabilities, including leadership losses, operational challenges, and increasing pressure from regional and international opponents.

Whether the Axis of Resistance continues to serve as Iran's greatest strategic asset or becomes an increasingly costly liability will be one of the defining questions shaping Middle Eastern geopolitics in the coming decade.

Key Takeaways

• Iran's proxy network spans Lebanon, Iraq, Syria, Gaza, and Yemen.
• The IRGC's Quds Force coordinates training, funding, logistics, and strategic planning.
• Hezbollah remains Tehran's most capable regional ally.
• Proxy warfare enables Iran to project influence while limiting direct confrontation.
• Recent conflicts have exposed growing military, financial, and political vulnerabilities across parts of the network.
• The future of the Axis of Resistance will significantly influence regional security and the strategic balance between Iran, Israel, the United States, and Gulf states.